Polar and Non-polar Molecules
There are some molecules in which distribution of two kind of charge are different so, that the center of positive and negative charge are separated by a distance of molecules dimention and forming an electric dipole moment.
Examples: H2O, CH4cl3
In general nuclei of molecules may be consider point charge because their size is too small in comparison to the matter and entire electronic structure of the molecule is considered as form single cloud of negative charge of the smoothly varying density among nuclei.
A molecule in which center of positive and negative charge coincide and thus the inner dipole movement is zero is called non-poler molecules.
Examples: H2, O2, CO2, Ch4etc.
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